EP 0394916 A1 19901031 - Ultrashort optical pulse modulating equipment.
Title (en)
Ultrashort optical pulse modulating equipment.
Title (de)
Modulationseinrichtung für ultrakurze optische Impulse.
Title (fr)
Dispositif de modulation d'impulsions optiques ultracourtes.
Publication
Application
Priority
JP 10173089 A 19890424
Abstract (en)
In ultrashort optical pulse modulating equipment optical pulses (Lp) emitted from a laser (11) in synchronism with input electrical signals (S) are modulated by the electrical signals, the modulated optical pulses are applied to a first-stage pulse interval compressor (41), in which they are alternately distributed, one by one, by an optical switch (17) to two optical fiber delay lines (141, 142), two modulated optical pulses delayed by the two optical fiber delay lines (141, 142) are brought close to each other, and modulated optical pulse groups, each composed of two closely spaced modulated optical pulses, are output from an optical coupler (19). Also in the next-stage pulse interval compressor (42) the modulated optical pulse groups input thereinto are alternately distributed, one by one, by an optical switch (17) to two optical fiber delay lines (141, 142) in which predetermined delays are caused in the modulated optical pulse groups, respectively, and then they are coupled together by an optical coupler (19), thereby creating modulated optical pulse groups each composed of four modulated optical pulses. In this way, modulated optical pulse groups are applied to n cascade-connected pulse interval compressors one after another, in which they are brought close to each other two by two and then coupled together, thereby producing modulated optical pulse packets compressed as desired.
IPC 1-7
IPC 8 full level
H04B 10/516 (2013.01); H04B 10/524 (2013.01); H04B 10/54 (2013.01); H04B 10/61 (2013.01)
CPC (source: EP US)
H04B 10/40 (2013.01 - EP US); H04B 10/50 (2013.01 - EP US); H04B 10/508 (2013.01 - EP); H04B 10/60 (2013.01 - EP US)
Citation (search report)
- [A] US 3604936 A 19710914 - KOMPFNER RUDOLF
- [A] US 3532890 A 19701006 - DENTON RICHARD T
- [A] WO 8504064 A1 19850912 - AMERICAN TELEPHONE & TELEGRAPH [US]
- [A] EP 0282071 A2 19880914 - CSELT CENTRO STUDI LAB TELECOM [IT]
- [AP] US 4866698 A 19890912 - HUGGINS RAYMOND W [US], et al
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0394916 A1 19901031; EP 0394916 B1 19941130; CA 2015039 A1 19901024; CA 2015039 C 19930323; DE 69014390 D1 19950112; DE 69014390 T2 19950511; JP 2719397 B2 19980225; JP H02281825 A 19901119; US 5099471 A 19920324
DOCDB simple family (application)
EP 90107651 A 19900423; CA 2015039 A 19900420; DE 69014390 T 19900423; JP 10173089 A 19890424; US 51220290 A 19900420